Abstract
The difference in chemical shifts between the two geminal methyl protons of the isopropyl groups of three sulfonium tetrafluoborates free and complexed with Cr(CO) 3, has been measured in a variety of solvents. The structure of tricarbonylchromium phenylisopropylmethyl sulfonium tetrafluoborate has been determined by a three-dimensional X-ray analysis. A tentative interpretation of the diastereotopic NMR shifts is given on the basis of the preferred conformations.
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